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Nonlinear Effects in AF-Amplifiers Caused by Thermal Power Feedback

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In transistor audio-amplifiers distortion appears, which cannot be explained by pure electrical phenomena. Because the electrical properties of a transistor are also temperature dependent, flucutations of the power dissipation lead to fluctuations of the junction-temperature. This thermally effected power dependent internal feedback (TPF) causes additional distortion dependent on the frequencies and the amplitudes of the driving signal.

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AES - Audio Engineering Society